I love what you did with the art kit, all these colors really bring the sprites to life. It's really engaging to play and the 3d perspective is a nice touch. I like that the wizard is rescuing the ducks. Could make it so that ducks could also turn back into goblins when hit with the left click spell, so people (meaning me) wouldn't spam both spells at once to take out goblins.
The jumping sections are quite punishing though and I have to admit that I eventually gave up at the area where you have to go up to get the red key and down to get the yellow one. The distance between the platforms to the red key is pretty hard to gauge and the controls are a too fluid. So having the player reset to the last save position before falling into the spikes could help with the frustration as someone suggested already.
Also goblins and ducks get stuck behind doors constantly, and I discovered that the wizard can walk behind the torches. Looking forward to an updated version of this, as I really enjoyed playing it (until I gave up hehe)