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There should be a market for in-house purchase of course not all tokens will be earned, some will be sold to unlock some important levels and features of the game

One can always get the shell tokens by converting the bora tokens. The bora token can be converted to bora shell tokens at a ratio of 1000:1

And these Bora tokens (the ERC-20 ones) can then be sold on any exchange. So this mean when you are lucky and receive Shell tokens for playing a game you indirectly get free Cryptos. I love this concept.

But the issue is that the Bora Shell tokens is scarcely given as a reward for playing games. One could spend the whole day playing a game and earn less than 30 Bora Shell tokens.

Do you expect them to give you a truckload of Bora Shell to fill your wallet? You need to understand that the purpose of giving Bora Shell is not to enrich you.