Simpler counter contract. Deploy with: https://remix.ethereum.org/#version=soljson-v0.6.7+commit.b8d736ae.js&optimize=false&evmVersion=null&gist=77712e006fbcbb4a138e6710b225e82e&runs=200

Counter.sol

pragma solidity ^0.6.7;

contract Counter {

    uint256 public count;

    constructor() public {
        count = 0;
    }
    
    function increment(uint256 increment_increase) public {
        count = count + increment_increase;
    }
}