Glad you liked the random generation, I put great effort here to make it feel like a "reasonably real stargazing experience" :P
The reward screens are random right now (I want to change them based on difficulty of the waves) but it can go from nothing to choosing between two items and money reward, so it is intended (although unfortunate).
I'm working also in the sound layer, and a bit of UI polish, so your feedback is mostly appreciated. Thanks for playing!