The game is fun, if you've ever played vampire survivors on PC, this is basically a mobile version of that. The game runs 15 minute chapters, usually taking 20-25 minutes including bosses, and has a lot of customization and build choices you can have. However, if you don't focus evo items, you're most likely going to fail.
The upgrades are nice, but they take away a good bit of the challenge if you upgrade too much or too fast.