Have you ever even heard of bullet magnetism
Blockland doesn't use that and should never be implemented, ESPECIALLY if it applies only to gamepad users. If you want to use an inaccurate control scheme, you get inaccurate bullets. Tough luck, this isn't a console shooter. It's a PC sandbox game. It wasn't designed to be gamepad-friendly and all downsides of using a controller over a mouse and keyboard are things you should and will have to deal with. It would be stupid to change the game to cater to the 1% of people used to stuffbox 360 shooters, as opposed to the 99% who are fine with sane controls.
Should there be an option for people who are somehow better with a stick than a mouse? Absolutely. It's your choice if you want to make yourself worse. Personally, I find using a Gamecube controller for certain gamemodes (particularly platformers) to be fun, but it's not something that should affect other people's experience.