Yeahhh maybe it's a problem with game jams, you aim for short play time because there are a lot of games and peopley play and rate it very fast. I played almost entire sheet 1, then used "jam cheat" and took a sneak peek at some later levels. But still got a feeling that there's a general lack of +/- signs Now I see it's quite abundant.
You did incredible job of adding new mechanic, it fits perfectly and works very well. I may reconsider my rating, however me not finding all those +/- levels must be a feedback on its own. I would wish these signs to appear early and never leave, and all temporal and death blocks to be introduced later on top of that.
Also, how do the locks work? Do I need to collect all plus signs? Or do I need to become a certain shape? I would clarify that part a bit more as well. This game and it's mechaninc is incredible nonetheless, I liked it a lot.
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That's totally right, if you had that impression it is totally right that the introduction of those signs should happen earlier, I think the main problems are level 7,8,9 which don't have any of the more interesting mechanics, my idea was to include them as a sort of a challenge to check if the player "mastered" the basic movements without all the other mechanics involved, and after those it can move on.
The Levels on the other pages unlock even when you did not complete all the levels in first page though, did you get a chance to see that? I am curious how your playthrough went to better understand how we can improve the progression
As for today, I have a lot of games to rate, have to rush and don't have time to test all levels for too long unfortunately. If you're willing to develop this game further, 1). you aren't tied to the theme anymore (though focusing on +/- helps to stand out above other sliding box puzzles a lot), and 2). you really need a proper testing team to tweak and arrange that many levels, with trailing mechaincs and concepts in consequent levels and gradual difficulty increase. Sadly I don't think I'm the best candidate for that, with all my own projects and busyness.
As for my short playthrough, the moment with "-" sign deleting part in the middle, and moment with using L shape to complete a level was "WOW" moments for me, good experience. If I ever find time to play more and have more feedback, I'll let you know. Good luck!