Allow for spending skill pointsi nto perks. After every level up you could allow for the Bit to gain skill points which you can either invest into permanent upgrades or which would be a kind of currency for allowing to equip additional programs directly to your bit. These programs would be passives such as:
- Increase attack by 1
- Increase speed by 1
- Has a x% chance to stun enemies on hit
- Gain a x% chance for eggs to be rare
- Gain 5% health recovered after battle
- Gain 25% additional health recovery from health program
There would be a lot of things you could add.
I also think making these be aquireable by combat would be very nice.
So, you'd have the capacity to equip programs, which would increase from leveling up. and the programs themself to be found by combat.