I really thought it was fun to play!
I wanna point out that from an aesthetic point of view, the different art styles and different sizes of the objects (the frog currently has more pixels that are smaller, and walls have less pixels that are bigger) was unpleasing to the eye. I think the frog and door having larger pixels - while still being legible objects, of course - would look awesome and fit the general feel of the game; but that's just what I think.
If it were more consistent, I would be super happy!
You probably saw this coming, but I would love more levels. I want to really feel them get more difficult as I keep playing.
Speaking of aesthetics, do you think it's possible to make the animation of the frog running just a little bit smoother? You don't have to, but seeing as that being one of the few things that actually move, it would add a lot. '
But hey! The animation that the red fountain had was really neat! You could try something like that!
Just wanted to point that out. No need to, if you don't want to :)
I only now just noticed that the yellow key is the only 3D thing in the game; that doesn't really show consistency either. Maybe make it more simple and 2D instead?
This is just me making up stuff, but what would you think about having more enemies in future levels? It really adds to the excitement having to run away from those! I would love seeing more foes in future levels.
The levels were a lot of fun to play. You're pretty good at making each puzzle different from the last. I just needed to say that, so you know that I do enjoy playing the game very much.
I really hope I don't seem harsh here! The reason I'm so critical is that I really like this game and I want to see it live up to its full potential. With more levels you could even get a small story line as to why the frog is stuck where it is.
Thank you for this experience!