Thank you! Yes, it could have a small tutorial, also there's a lot of stuff going on at the same time, so if it is your first playthrough it can be confusing. The going back to the first level is as intended, because the game is really short (only 5 levels) the player should play many times until they master the mechanics. But to remedy this I am thinking about adding a "custom game" option, so you can customize the way you play the game (hearts, summon level, upgrades and game level), so I do have this in mind.