Woah, this has so far been my favourite game of the bunch I've reviewed!
Really solid game play. Also love the fact that you have a whole tutorial explaining the mechanics and shop system. There's a lot of polish and care in the game and it really shows.
I think I've encountered a bug. Occasionally, the next round would trigger by itself. I tried to collect the money or do some shopping and it'd just jump right into the next wave. I had this happen a few times during both my runs.
I managed to beat the game on my second attempt, I think I got lucky with my drops and bought healing quite early on. I used pulse almost exclusively and a few times the sniper when I had to wait for the pulse to reload. It would've been nice if the pulse would automatically refill between rounds so that the player isn't incentivised to wait between rounds just to reload the weapon.
All in all, I really enjoyed the game and you've done a great job with it!