Like the graphics and game mechanics. However it took a while for me to understand that I could 'climb' on walls if there was grass. Not sure if it was by accident or that I saw your gifs that made me realise. So some kind of guide or tutorial would have been helpful since with fire you soft-lock yourself all the time.
That is also something that annoys me, that it's super easy to get soft lock if you use fire, especially since you need use fire to boost yourself and if you fail and get back to checkpoint there is no way to undo the burning blocks other than restarting the game. But I think that is more or less what you are looking for? One of those frustrating game that you need to make everything perfect otherwise you need to replay.
To be fair, once you knew how to get past the obstacle it would go easy the next time.
Unfortunately I did not had the patient to finish the game, but a good game nonetheless. I am missing some kind of music however.
All the good luck to you guys!