Few notes for ya! =)
Here are some problems i found in individual levels.
Level 5: you can just jump to the right straight into the portal.
Level 6: Similar to 5, but you can just jump left into the portal. But it may cause problems for the next level once it loads.
Level 7: If you had jumped left into the portal you might glitch through the floor and respawn fall. meaning, you'll go through the floor hit the part where it restarts you but you glitch through the floor still. Sometimes it will stop, but be careful. But there is also the problem where if you jump between some of the spikes, you'll fall through the floor.
Level 8: Don't understand both the steroid comment (ince it wouldn't realy make you jump very high) nor the whole fall through the floor thing if you do jump. It is especially bad when you jump buy the portal and fall through the floor, because you don't respawn.
Level 9: Lol, if you go right, and jump off the edge of "Pacman" you'll either fall forever, or just be transported to the next level.
Level 12: It would seem, at least for me that everytime it loads, you start out respawning.
Level 13: If for whatever reason you don't get into the portal at first, you can go off the left edge and fall forever.
Some of the glitches I found would probably only have been found if someone was being an idiot, or was searching for them, like me lol
Anyways, since there have been a couple of reviews of "Better are and other stuff shit" I thought i would try to give you something more. Hope it helps! =3
-Review Request Club