For your first game jam, this sure was really creative and interesting! The graphics looked really nice and the controls and music was really good. A few things I would suggest though is to further explain the objectives of the game. I was throwing into the game not knowing fully what to do and although the arrows were a nice touch on where to go, I didn't know what to specifically do.
Also, I would suggest adding a restart button so players can restart the level if they mess up, which chances are, we might on our first try.
Lastly, the game does need polishing in a couple places such as feedback from enemy attacks and regaining our drawing in some way or an explanation on how to recover our drawing skills.
Other than that, amazing game entry and nice work on it!