Enemies drop ability cards as loot and you can slot them into slots 2, 3 and 4 at the end of the level. Glad you had fun with Dash though! We spent some time tuning that so it would feel fun to use without the other abilities. Thanks for playing :)
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It's in between levels. There's only one level, but after you finish its waves (there are four in total), you can exit the level via the Exit Portal, which takes you to a screen where you can review your cards and equip them - then you can replay the level to try them out. We were planning a Living Room level next but sadly it didn't quite make it in!