You found some cool sprites for this one! I found it fun that I could kind of cheese the levels and make a beeline for the stairs on every level, especially when there were so many enemies that it made it impractical to try and best them all. Balancing is a tricky thing when designing a game like this - it's important to think about making the player weigh the challenges and opportunities. Maybe a few upgrades or consumable items to discover could make the player consider taking more risks?