Thank you for playing through the game and making this review🔥. I really appreciate that you like some aspects about the game, especially controversial ones like making puff-shroom more expensive. Fume shroom technically has more DPS than peashooter but since he shoots slowly, it's kinda hard to tell. and pineapple bomb is basically a low damage mini jalapeno with a horizontal explosion radius of 5x1. I see that there are things you didn't like here and I'll respond to each of the problems that you had.
1. yeah the RNG is somewhat heavy in this game, since the bloons could spawn in any lane which includes your vulnerable ones, but this was intentional since I designed the game to be difficult. but there will be quality of life improvements like a difficulty selection and a slow-down button in the next update, this will make the levels easier for casual players while offering a bigger challenge for experienced players.
2. potato mine is a little harder to use in this game due to the fast bloons, the best way to use them is to place them behind a wall-nut while having an attacker weaken or pop the faster bloons that could run into your potato mine and protect the slower bloons behind them. Potato mine in last stand isn't bugged, I made it take only 1 second to arm in these levels so you don't have to wait for them and also they could come in a pinch in the middle of the level.
3. this was a bug that was established a while ago, early in the game's development, I didn't know how to make the bloons stop in place to eat the plants, so I gave them real physics which makes them physically stop when eating a plant, this means that they are technically constantly moving even when eating a plant, changing this now would take way too long so my plan was to make the bloon hitboxes thinner so they don't clip above of below a plant, and while this still evidently has its issues, it's the best solution that I could find here. But I will look into the issues of the short plants since I think I can fix that easily.
4. I should probably add a timer on the corner telling you when the bloons appear.
5. Projectiles normally can't hit puff-shrooms, except for the peas from the pea grave, they are low enough for them to hit your puff-shroom, but the projectiles from gatling pea bloons can't hit your puff-shrooms.
6. Here's how I beat Last stand 2, start by placing 2 columns of peashooters, 1 columns of puff-shrooms and 1 column of wall-nuts, this will leave you with 250 sun which is enough for 2 cherry bombs, you don't need to do anything for the first 2 flags but when the third flag comes, look for the densest clump of bloons and place a cherry bomb there, this should lower the weight on the wall-nuts and keep them alive, and when the 4th flag comes, you do the same thing which is placing another cherry bomb in the densest clump of bloons. you might lose a wall-nut before the final flag but that's ok, what matters is keeping all your bloon chippers before the flag, and when the final flag comes, the bloon chippers will take care of the MOABS and you should be able to win the level. and for duel mode, some bloon cooldown are long because they are quite strong, lead bloons and newspaper bloons are good examples of this. also red bloons have a 5 second cooldown which is the fastest cooldown in the game but I might tweak some other cooldowns like the blue bloons.
7. I plan to add a miscellaneous almanac which features stuff like graves, helium tank, and other objects that don't fit in the plant or bloon category. And yes, grave stones do take reduced damage from explosives (half to be exact) so cherry bombs do 25 damage to them and pineapple bomb does 10 to them. And Pea graves aren't meant to damage bloons, the only helpful graves are the sun graves.
8. I plan to shorten coffee bean's animation so it does its thing right after the sound effect plays. Also coffee bean is reworked to give boosts to plants instead of only waking up mushrooms, this ends up making him very good with sunflower since you spend 50 sun and make 75 sun back, that's a 25 sun profit.
9. This is how I wanted to design MOAB class bloons, it makes them feel more gimmicky compared to the normal bloons, and if I made them eat plants normally instead of ramming into them, it would be a little boring and make MOABs not feel special. And yeah I buffed ceramic's health from 10 from BTD6 to 20 here because 10 HP is way too low, they would just feel like slightly faster conehead bloons if they only had 10 HP.
I hope I managed to address all your issues properly and I am looking forward to more of your feedback.