Thank you very much! I kinda like the "platforming difficulty" idea but for now I'm keeping it in action difficulty. If you have a big issue with pitfalls in-game, switch to Easy action difficulty and the pitfalls will be disabled. You won't miss out on any content (unlike riddle difficulty) and there's no shame in playing on easy difficulty especially if you only want to beat it and move on; That's why the difficulty options are there.
If you still plan on playing with the normal/hard action difficulty, then if you trigger a pitfall- don't press any buttons and let the player bring himself back up. If you press the forward/backwards button while the player is about to fall, you'll push him to his death (just like SH3). The mechanic was improved in v0.1.4 so that on Normal difficulty, if you trigger a pitfall and don't fall, you have 1-2 seconds invincibility from the pitfall triggers. (a user suggested that on the server so I implemented the 1-2 second invulnerability)
If it's the enemies that give you issues because they push you into holes, then you'll just have to avoid the holes as best as you can. If you're going into combat, keep track of where the pitfalls are and move to the spot with the least amount of danger. I hope this info helps and good luck. :)