Nice tiny game, I like it! Many different objects and randomized maps work great and make me wanna replay to explore more things. I'm waiting for more types of enemies and other content :)
It would be cool if you add some delay between cleaning the level and appearing of reward. Sometimes I misclicked on reward or "Skip" button because I was dealing with a zombie in that area.
Also, when I got rewards, it wasn't clear to me that I should click exactly on the reward to get it. Usually, rewards are auto-picked up in other games. But I see that in this game you should decide if you want it or not because sometimes it replaces what you have (like different cursors). And I thought "Skip" meant auto-collecting the thing and going to the next screen. For me, it would be helpful to have "Collect" and "Skip" buttons to quickly realize, that I can choose.