Initially we didn't have a portal-esque game in mind but during development I also started noticing the resemblance. The timer was indeed added last minute, that's why it gets a little buggy after reaching the minutes. What do you mean by the timer being too tight? There shouldn't be any time limit on the levels, it's purely supposed to track your time playing.
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So whenever I would press a button to turn off a green wall, it would flip the switch back again before I could reach the area past the green wall. The first two times it was used, I had enough time, but I think the third time I was getting stuck because I couldn't get to the spot fast enough after retrying it about 15 times. Haha. Totally understandable that there will be bugs and balance issues in a jam like this. You did a really great job with the restrictions and this is probably my favorite entry.