Hey!
Cool idea! I was able to collect all 50, but got 'pinched' between the wall and the bad guy so I didn't get to go through the gate. Overall pretty cool! My two suggestions would be to lower the collision boxes so it doesn't feel like you were far enough away from them and to add some background music to the game play too. I like the sounds, I liked the monsters following you and how you have to lure them away to get the gems. Well done!