it is a really nice game.
I think the problem is right at the beginning. The game is not necessarily hard, but the controls are hard - those are two different things and the latter one is never fun.
When you play on the desktop, clicking to move is really inconvenient. Perhaps arrow keys would be a better fit?
Another issue is that the tutorial restarts from the beginning when you die, which was a deal-breaker and I wanted to quit.
I tried to play again though, but when I entered the second level it was super similar to the first one - you just fly through a cave. If you have any variation in the gameplay (enemies, moving objects, teleport, whatever... ) you should probably show it in the first levels to give players a clue that something more is coming.
Please do not take this negatively, I think this game has potential. It is really nice and I like that there is a story as well.