All is great except game's length. Perfect sound design, perfect gameplay mechanic, cool graphic (for LOWREZ). I don't know when you started to make your game but unfortunately as you stated in description it's a prototype and not a full game :(
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Thank you for the kind words and playing the game!
It took us around 12 hours to complete the game. Unfortunately, we couldn’t implement some more interesting features as well as polish elements, but it at least works as a prototype. I thought of adding 10 waves back to back when I first designed the game, but it is pretty short right now, as you have mentioned. Maybe I will update it once the voting period is over!