Nice!! I remember playing a game like this called Knife Hit back as a little kid... super cool to see a game like it in this game. It's a spectacular choice for the theme: it satisfies the limited shape condition + limited space theme both perfectly!
The gameplay is smooth and intuitive. While simple, it's quite easy to understand and equally as fun. High marks on gameplay :)
The audio and art is also quite well done. It fits the game's vibe and is polished and consistent.
Everything fits together really nicely l and the game overall excels in pretty much all categories. I don't have much to say in terms of feedback - really well done!