The problem Gassed solves

Many dapps have a huge entry barrier, as to interact with their contract and use the erc20 tokens, users need to own ETH/MATIC or the chain's currency to pay for gas. Common People who own ERC20 tokens, own it under centralized exchanges and they don't even know that they need to own the chain's native currency to pay for gas even to send tokens like DOGE to their peers

Challenges I ran into

Not much, Things got complicated when I wanted to support multiple tokens. As of now we are sticking with USDC in Goerli