I know how everyone is saying the game is hard, but to be honest, I found it easy.  I plopped the normal towers on the right and left sides of the map and put the fire towers in the middle.  From there it was like the game took care of itself.  It was a bit tricky early on, but well-placed bombs meant that enemies were not getting close to the castle.  It was easy enough to reach the "You win" screen.

A fine job, overall.  You got the mechanics of a tower defense down well.  You kept it simple and reasonably effective. The addition of limited bombs helped to cover for early game weaknesses and is a good mechanic to add on.

Notes:

• I found trying to click on a tower to build AND having the airship move towards the bottom-right corner to be annoying at times.
• I had to go to full screen to play the game.

Cool graphics—I love the balloon sprite! I also found the game to be pretty tough. I was able to build towers in my first play through which got me into the second wave, but then I couldn't seem to bring up the build menu in subsequent play throughs (I just needed to hit E to show the menu, right?). I'd be curious to see how your game would play differently, too, if the balloon's movement worked so that it'd move to where the bomb would be placed when hitting space  rather than moving the balloon and then having the bomb's placement be several pixels below where I clicked. This would probably make it easier to line up those shots! Also more audible feedback when clicking or interacting would really be nice too. Thanks for making and sharing your game!

game is hard! i also had a hard time getting past the first level. the bomb animation and airship was super cool and I wish the bomb at least 1-shot enemies cus I FINALLY hit one and it didn't even kill it haha

Great cover art too!

I couldnt understand the gameplay but really cool you did better then me!! 

Cool idea! The slimes were just a little bit too fast, so I lost pretty quick.