Nice simple game!
I like the simple cartoonish / drawn look, it can be a hard look to get "right" and I think this game did it well.
Being able to step through and test is very nice, since it reduces some of the mental load of trying to predict everything. It would also be cool if we could slowly add more of the robots, so we could build up the room slowly, since sometimes I just wanted to test a section but had to make the whole room anyway.
Having a collision make the whole room reset though is annoying, since it can be hard to remember what you did before.
I think the game may need a few limiting mechanics, since on levels 7+ you can pretty simply just give each robot their own column / row, and they will never collide.
Watching over the sequence is very satisfying, but it also becomes a bit of a "screw it, let just send it." button when you're carefully stepping through at first, which is a fun dynamic change.
Level 10 was awesome, I immediately realized how great it was going to look on the playback.
Nice job!