Hmm, so they're not any less slippery? I've noticed the triangles seem to get suck it the position they drop from, rather than flipping upside down, which seems different compared to how it was back when I initially got my high score. I've been trying to beat it again but the triangle don't want to flip over, instead sitting like this:
At first I thought it was a consequence of combined shapes picking the fastest moving ones orientation but it seems to happen even when just dropping the shape, albeit it's rarer. This isn't an issue at the start but the longer the game goes on, the more likely those shapes will get buried under others and remain like that.
I'm also curious why you're set on making the game harder, at least for the "main" modes? Is it just to make it more like the original, where double watermelons are something most players don't get or is it a personal design choice?