Been following development of this for a while and it's got potential to be really great.
As it stands there's quite a bit that can be refined to make huge gains in playability and levels of fun.
The UI needs a pretty big rework, the health and XP across the top with backwards bars isn't intuitive or very useful, a face of the character/turtle with changing face states and the bars around each side of the portrait would work well and be way nicer to look at.
A tutorial run should be the first run anyone plays. The super quick on screen tutorial that is there now is hard to follow and it leads you to feeling very lost in your first run. A separate tutorial that runs you through your first few levels while showing you how to aim/target/gather etc at set points would make a world of difference.
The aiming is also hard to judge, it could possibly have an ghosted intended path to show the way? Or at least a power up that improves this.
Anyway just some ideas/thoughts. The game is really fun and I'd love to see you have a great launch for the full game!