A lot of nice things here. I liked the sprite work of the main character. The jump controls feel pretty good. The shape-shifting mechanic is neat. There are some things that made it a little difficult to play, however. Combat is really tough, especially with the flying enemies. Some more knock-back would be really helpful. Some sound effects are either abrasive or too loud or both (the attack sound especially needs attention). I'm not a fan of the warning sound when your health gets low. The climbing ladder mechanic seems off; I didn't expect to just fall straight down when I tried to go horizontally to an adjacent ladder. The spikes acted as a trap sometimes--I couldn't escape after falling. The camera was interesting but I found the shakiness a little nauseating. And yes, that upgrade sound is VERY FAMILIAR. That said, I thought this was one of the more promising entries I've played, and I enjoyed giving it a test run. I would be excited to play a more developed version (especially with music!).