Hey, thanks for playing and for the kind words!
You're right - running into a wall is what's meant to kill the player. If you try to move the world towards the player, he's pushed from his axis and falls into oblivion!
Unfortunately, we found a bug after uploading - in the second part of the first level (i.e. after it has wrapped for the first time) the death colliders no longer work. When we were testing the death triggers, we only ever tried running into the first few walls... We've fixed it in our own version, but alas it's too late to reupload!
Hopefully our intention comes across in the part of the level that does work!
Fair comment on the inverted directional controls - the intention was that the player would feel like they were moving the world, but I can definitely see how it just feels like a backwards platformer!