Looks like a game that could be good for mobile, I guess that's where you were heading because of the resolution size. I feel like the game requires more polish, both to make it engaging and to make it look awesome. Instead of just having to see the static movement of the enemy and the number of the health of the enemy, I think it would've been nice to have more animations and more visual effects, with sound effects too. I also see that you've used many of the sprites from the asset pack, I think you were trying to use most of them, some have creative uses, which I think is pretty nice.
Overall, its a good idle game.