Thanks for your feedback (and your awesome game, which I loved)!
And no, there is (currently) no other level since it is only meant as a super-casual "pastime" game.
I could add a highscore board in the next update so each game would be battling against yourself from the past
(like in the old arcade games:
"123 BOB
109 ALC
033 LOL")
Any ideas what I could do for a different level?
There are actually three songs in the game, which you can choose in the OPTIONS menu :)
If the enemies hit you / got through there should be a big red particle explosion around you - is this working for you? And yes, I wanted to add some health indicator for the player, but did not have enough time in the end to integrate it "seamlessly" - but I will do that in the next update.
For the end of the cassette tape I think I will add an option whether the game music should stop as well or maybe be muffled somewhat. I did not want it to be super-obvious as I think that is part of the challenge to wach the little spools from time to time ;)