This is nice; *great* for a first game. The story was interesting, even though it's quite common in platformer games. It is good when a platformer isn't just all about "hop all the way to the end", but has also another layer.
I liked that the game mechanics wasn't the same all the time (wind and gravity experiments, etc.), the main models look fine, but you can't really enlarge a tiny pixel figure of Katherine across the whole screen (and add rotated versions of her), it doesn't look very good. A silhouette might be better. The same applies to the monster mess after the level in which you cross the invisible bridge and take the yellow ring.
The difficulty was reasonable, but hard for me because I had to restart the game four times as (in different levels) the plugin suddenly crashed, I don't know why.
I had a slight feeling that the beginning was more worked-through, as you venture closer to the end, the tiles become simpler and are cut either on bottom or on the side (for example the level with "HEAT" written all across the sky and the grass levels afterwards). A little problem I had especially in the cloud levels - when you jump *facing* a tile, you go up freely, but when you turn around and jump from the same spot, you get blocked.
Some of the other bugs I found:
- In the "red level with stairs and a monster going down", the monster can fall on your head and stand there, not hurting you at all
- In later levels, there's a tiny transparent dot in the bottom right part of the screen, it shouldn't be visible I think
- Are the squares in text (for example in the "long fall" level) intentional? Maybe unsupported font, I don't know.
- You can stick to a tile if you keep holding an arrow key (but you say something similiar in your Note 3)
- In the wind level, the first "hill" can be partially passed through
- In the epilogue, a "Th" shadow appears behind few texts
That's all I could find, hope that helps.
I think the very end could be done in a more interactive way, because you play through the game with little to none knowledge of the background story, only knowing that you have to get your memory together. When the real story begins, you can only listen.
But I hope I didn't make you upset - as I said in the beginning, the game is very good, well done.