Ryuku was interesting. I would recommend an option to invert the AD directional controls. There was also a point where the tutorial text was perpetually stuck on the screen. Combine that with the additional snake thing ghosting your every move and the gameplay was a little confusing for me. I did lose at 79% so I will never know the fate of Ryuku, unfortunately.

I think a nice addition would be to allow Ryuku to eat the enemies if they get in the way, rather than just glide through them. Either way, not bad for two days.

An interesting idea, game-play was quite fun for the first round, graphics are simple but work, particularly Ryuku and the other, space snake? 

I assume the "fusing" was how you linked it to the crafting theme? I couldn't really tell if it was making a difference to Ryuku I think it would have been nice to do more with that.

I enjoyed my play through even though I lost at around 89% :(

I have something you can add. make levels and make them harder as you go on because I feel so bored of no accomplishments when I play the game