Yes I played Twinsen's Odyssey (aka Little Big Adventure 2) a long time ago.
I needed a cheat to finish it.
I used that cheat almost constantly to restore health.
There used to be a guy on the adventure newsgroup (Geoffrey Tobin I think) who was crazy about it and thought it was the best game ever made. As long as he was still posting to the newsgroup he extolled the virtues of Twinsen's Odyssey, and urged everyone to play it.
I still have Twinsen's Odyssey in the box.
I haven't tried the GOG version.
I don't know if the controls in the GOG version are different.
I think it used only keyboard controls. I don't remember them being terrible, but back then I had fewer problems adapting to game controls. If I needed to, I'd tape little squares of paper to my keyboard, marked with what the key did, until I'd memorized them.
It had one of the longest, most complete final "happy ending" cut scenes I've ever seen.
Here are the cheats:
To enter these codes, press ESCAPE to call up the menu, then enter one of the following codes.
Life: gives you full life
Magic: gives you full magic
box: gives you a clover box
clover: gives you a clover
pingouin: gives 5 nitro-meca-penguins
gold: gives 50 coins
full: gives full life, full magic, and clovers
speed: gives frame rate
I tried to play Relentless (aka Twinsen's Adventure aka Little Big Adventure) but couldn't finish because it had no real save system. It hadn't been designed with a save system, so they ended up with a horrible kludge where the game would automatically overwrite the save you were playing from, and if you messed up you'd have to go back to a save you'd previously duplicated before playing from the save. You were always forgetting which save was still good and duplicating a junk save where you had no health left by mistake. I got maybe 5 minutes into it and gave up.
For their next game, Twinsen's Odyssey, the developers wised up and made the game with a decent save system. Maybe with a DOSBox version that has save capability built into it I could play Relentless, though I'm worse at keyboard than I used to be.