Thank you for your feedback, you were the first one to bring it up, but now that I think about it, you're right, being able to open the door from the back, while promising secrets at the beginning, feels a bit irritating if nothing is hidden there (might include something there in the post jam version (: ). Also the thing with balloons and cannon balls was intended to break up the game a little bit, I think it worked pretty well, but I totally get your point, we're the developers after all, so we might have a different feeling about that.
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so the idea behind this was that the character is walking on the cassette like on a treadmill, so the player itself does not actually move and the objects pop up along the tape. But the bullets and balloons spawn in the "real world", the world the cassette is in, they are not affected by the tape. Thx for your feedback though!