Alright, I've got a lot to say about this experience.
First of all, I love how cute the artstyle was. It made it a lot more enjoyable, and overall was very good on the eyes. Second of all, the music was very appealing, my ears give their thanks.
I do have some criticism, however.
The UI sometimes overlapped with itself, making it hard to read. Some transitions, specifically after dying, were a bit messy. The tutorial doesn't have a specific end, which almost led me to stopping my playthrough early, until I noticed the screenshots having more.
The difficulty curve was also too steep, as I didn't understand what the upgrades I were adding did until after I had already died trying to use them. Controls for said upgrades also weren't noticeably mentioned anywhere, as far as I know.
Overall, though, this was an enjoyable game to play. Good job!