I had a hard time with this game. When I was brainstorming for this jam, one of my first thoughts was to make a reverse tower defense game like this, but i rejected that idea because I felt like it would be too hard to implement well. The problem is that when the only things the player can control are when and what to spawn, it can really feel like the game is out of your control, which is how I feel with this game. I got hard stuck on the second level because once the reinforcements are built, I just can't get anything through. I want to like this game, but I just can't play past the second level. Also, there seems to be a few technical issues. The buttons for spawning are still clickable, and still trigger the cooldown, even when the player doesn't have enough coins. Disabling the buttons when you can't afford them would be a very helpful UI change. Also, having a quit button in your web game doesn't really work, so you should disable that on web builds.