Thank you for playing :)
For sounds I pretty much hit random for different categories on this tool https://www.leshylabs.com/apps/sfMaker/ then saved wave file if it sounded kind of ok.
Wish I had more ideas for levels, which are surprisingly hard to come up with, and the whole menu could do with implementing, so I feel there are bits I could have done better, but I'm glad you liked it, sometimes you need other players feedback to not be too self-critical :)