I think it would be nice to add cubits as an additional reward to each of the feat tiers. While I don’t personally feel this game is P2W at all, it may help lessen the overall feeling of P2W if you can obtain cubits in other ways than gaining levels. For example:
Tier 1:
- 500 XP
- 100 Coin
- 25 Cubits
Tier 2:
- 1400 XP
- 280 Coin
- 50 Cubits
Tier 3:
- 4300 XP
- 860 Coin
- 100 Cubits
Tier 4:
- 12,800 XP
- 2,560 Coin
- 300 Cubits
Tier 5:
- 38,500 XP
- 7,700 Coin
- 500 Cubits