This game was awesome! I really like survivor games, and I definitely think you have something great here you could polish up into a proper full game. The way you used the theme was really cool, the graphics look awesome, and I do think it's interesting to have the goal be preventing them from reaching the side of the screen like old defense games used to do but you can also distract enemies to have them follow you. If you add some more variety of weapons and passives, I bet you could definitely release this and people would dig it. Endless option after the boss would be really cool too, maybe looping around each 5 minutes with increasing enemy multipliers?