Controls work really well for this. The idea is hilarious and the regularity with which Maribel wakes up when you're close to the end is incredibly tense and frustrating, but that just makes it funnier.
It took me a good while to get used to spotting the rabbits and sheep in Merry's dream bubble that were about to wake her up, but eventually I got the hang of avoiding being spotted!
I also love the artstyle. I found mashing the keys a bit awkward, though - might just be me.