Just a small update this week, extending the challenges you can attempt:
Challenge: Buy X upgrades after rerolling the shop
Challenge: Win the treasure chest jackpot
Challenge: Break X pinballs
Challenge: Kill X enemies with pinballs
Challenge: Kill X enemies with max damage pinballs
Challenge: Deal X damage with a single pinball
Challenge: Kill X enemies close to the base
Challenge: Get X critical hits
Challenge: Deal X damage to an enemy with one attack
Challenge: Stun X enemies
Challenge: Set X enemies on fire
Challenge: Deal X knockback damage
Challenge: Push X enemies off the level with shockwaves
Challenge: Win a run with X empty upgrade slots
Challenge: Hit X enemies with one attack
I've probably gone a bit overboard with the challenges early on - you'll activate a load of them on your first run. They need some tuning so they get spaced out a little bit more.
"Win a run with X empty upgrade slots" is a particularly interesting challenge as it forces you to pick and choose your upgrades carefully, and sacrifice empty upgrade slots to boost the few upgrades you do have.
All these challenges are the foundation for the game's progression system. The next update will have the first glimpse of that: a new playable character!