This is a really solid game, can be quite addicting. A bit difficult to get to the end but I enjoyed it still.
The simple Pixel art fits the game really well, the controls feel nice, and the sound design is well done. I don't really have much to critique, mainly suggestions - The game could do with a waves or a level system, having upgrades, being more difficult, maybe adding other things to do as well. But those are really up to the dev
Overall it is really well polished. And I enjoyed playing it a lot.