This was really fun to play, and I loved the art. Sadly, I also got stuck on the level up screen. But, great job mate!
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Thank you for playing! Other people mentionned this issue with the Level up UI. Here was my answer if you still want to try the game till the end of the countdown:
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It might be because of the mouse. I know options can go out of focus because of that. You can point/click with your mouse to focus again on the power up you want. Then press spacebar to confirm your choice. Normally, you should be able to select the power ups with just arrow keys and space bar. Hope this solves you issue! :)