Pretty simple game. I think I also played the other turtle game with same kind of mechanics.

Actually there is no challenge at all and so I was bored after 800 points

It's a nice game, thank you.

I have to say - the sound waves were a pain to watch (literally an eye strain). For me they served nothing else but to make the game harder. Maybe if there is a higher resolution image that problem would disappear.

I think the decision to use the seaweed for both healing and scoring made the game too easy. If you separate the two (decouple) it would be more challenging => more engaging.

Let's image for a moment that this is a full game, not a prototype. The current way the game works would be one of the modes - an endless mode. For the default gameplay a more interesting mode would be to have levels with some predetermined score to pass the level. And ideally add some leveling up system to upgrade the turtle - speed, hit points, etc. Basically the design of the game would follow a stepwise difficulty curve - each level would be more difficult but the turtle would be more capable.

Possibly - you can make the different items fall with different speeds. That would make it more interesting. Right now it seems everything falls with the same constant rate. Maybe the first (or two or three) level(s) can be with a constant speed. But then switch it up.

To be honest I intentionally made the turtle die (yes, a horible thing!). Just to see the end screen and be done with the game. I mean - I also hit pause but I needed to see how the game finishes too!... please don't disqualify me...

Good luck!