>>11953504
Don't be fooled, it's a Rareware game on N64 which means there's a lot of items you need to collect in order to beat the game, you even do a lot of backtracking near the end to go to previously-inaccessible areas.
Also if you want to play Jet Force Gemini you should have a real N64 controller on hand, the controls are laid out like this with C-Up and C-Down being your primary face buttons.