Currently in the process of making a main menu and settings page.... It's slightly harder than expected, but we're working towards it. It probably won't be out for a while, but I am trying to make the physics(at least some of it) customizable to the player (but having these turned on would likely not allow you to save high scores, or maybe be a seperate high score, not sure yet). I don't yet have multimerge implemented persay(in that the game doesn't acknowledge it), but theoretically if 3 of the same touch, they should become the next tier(because the game counts 2 collisions before properly removing the smaller pokemon) as for drop merging, that can be very easily added by just lowering the drop cooldown, but I was worried it would be too overpowered to just spam if the cooldown was too low. Definitely just the type of thing where you mess with values and see what feels right.