Common enemies 2 shot you. Bomber imps (common in the first area) take off 2/3 of your health bar. You need to defeat bosses without taking a single hit to get actually good upgrades (e.g. beating the first 2 bosses flawlessly increases your basic attack by 50% while the store bought incenses are mostly useless) which is very annoying to do since bosses have contact damage and move around erratically. The environments are very bland and samey looking, it's just endless hallways with locked doors and it's easy to get lost. Overall, a huge downgrade compared to Momodora, wait for a deep sale or skip it altogether.