I liked it. It has a cute artstyle. I feel like the boss had a little bit too much health, and the time between his attacks was a little to slow. The game was at it best when there were multiple attacks & effects going on. It could benefit a lot of having more stuff going on, for example, some small enemies that shoot but get defeated with one bullet? Also, a faster pace would be nice. Also, the joke at the end screen of the dragon just looking confused at the debris of the hand, because he was asleep the whole time was pretty funny.
I feel like it has a lot of potential, great work overall.