People already said it but I would not have been surprised if this was on steam or another platform as a small game!
Really well done!
If anything, I think you would gain adding somewhere in the menu a way to change the difficulty, for new player to keep this pacing (which is nice!) and strong players to have a harder version.
Also... A pause menu, on pressing escape... I think this one is almost mandatory haha, could not find it and could not keep my strike when I had to leave the game for a bit.
Congrats