Thank you very much for the detailed feedback.
We're definitely aware of the shortcomings of the game, all of which we will obviously blame on time constraints; after all, this game was literally submitted in the last minute, as we were still dealing with bugs until then.
We would have definitely added a menu and made everything clearer if given more time; perhaps we overscoped a bit though. As far as the gameplay being too easy goes—I personally definitely prefer difficult games, so I wasn't sure how to approach it here; I decided to follow Jonas' advice on making the game easy to finish so everyone can experience it fully in the limited time they can spend on playing one game. The final boss deals 5 damage to you instead of 1 as a balancing factor though.