Really loved the cute / paper art style. Also found the gameplay / upgrades system super fun, felt like going back to figure out the right upgrade paths to progress. Even a bit stressful at time! though I always felt it was at the right pace.
I did though run into a couple of issues when purchasing weapons. I wanted to replaced an existing weapon with one I just rolled, but find out after rolling that I had to delete a previous weapon first. Also I was able to roll away all my money while selecting a spot for a weapon, which rolled the wheel but didn't give a reward. Oh yeah as others have mentioned I lagged every time I stomped at the later waves.