Honestly, great base game! I think there is a lot of potential that you can make this game into!
I found no bugs. The core gameplay did feel a bit easy after you learn how the enemies work. I'm usually bad at these types of games, and it felt easy, so you should probably increase the difficulty and make different types of enemies. But for the core gameplay loop and demo, this game is very good. I think there is also space to add more to the environment to make the visuals more interesting! Otherwise, great game!