I'm playing on default mode, have just got the last shard, really enjoying the exploration and dungeons. Definitely going to keep going to the end.
I've had other robots dying left and right as I won't give up my dust for them. What happens if I run out of time, do I have to start again? Never explained, and I CBA with that, so die they must!
Found some of the bosses tough as they spawn lots of annoying little buggers and I got overwhelmed. A couple had quite a few screens to run through from save point to boss which is just annoying when you're a bit rubbish like me and take a dozen attempts to win. Just put a save point in front of the entrance please, devs! (And let me button mash through the "oh noes Alma..." stuff you get every single death.)
A lot of complaining I know, but I'd recommend the game. I do like a good metroidvania.