Cool game! First off the visuals are top notch and the audio fits well. The upgrade system works great and it was genuinely interesting to see how they could enhance your moveset or provide another useful utility. I particularly like how there's actually more options in the movement than there intially seems because of how 'bouncy' it is and how small your hitbox is - like I was able to go under the water to avoid enemies travelling across the surface. Only issue I came across is I think it's possible to accidentially skip through the end screen showing how many waves you survived as it seemed to disappear instantly for me so I didn't even know what the number was. :(