This is an awesome demo that really shows the concept!

Pros

• I enjoyed the level progression, that as time goes on, you can ascend to the next platform or stay lower and farm until you feel ready to ascend.
• I like the idea of the power-ups and that you have the option to take them or not.
• The random chest spawns and hearts that you can pick up added a fun aspect to the game. I feel like they were important secondary objectives.
• I like the different enemy types and can see real potential to make them a bit unique.

Cons

• I wasn't a huge fan of the "reload"/"CD". It doesn't feel good when I'm waiting for my character to reload. Either make it a bit faster off the rip, or get rid of it altogether.
• Most of the power-ups that were offered didn't feel strong enough for the debuff to be worth it. Perhaps that was a skill issue, but I opted out of taking them most of the time.
• The enemies felt overwhelming at the start, I think the ramp of difficulty should be much lower when you first start.

Overall, really impressive start right out of the gate. I can see this project having the potential to rival other bullet hell games. Well done!