HTML 5 Game that runs in a browser

Suppose you are a cyclist on a route with uphills and downhills, depending on the slope you will have to shift gear to always have the ideal ratio. At the start you will have to pass from the 1 to the highest gear and then, as you advance in the circuit, when the slope changes, adjust the gear. At the moment in which it is necessary to shift gear on the screen appears an indicator (up arrow or down arrow in the graphics) with a ring that fills up gradually, if the user shifts (tap) at the exact moment in which the ring is in the center (indicator upwards), the gear shifting is perfect and the user gains boost (the boost indicator at the bottom left in the graphics fills up by 20%). Boost is an increase in speed, by pressing it the user accelerates by 40% compared to the speed of the game and the boost is consumed gradually (2sec for every 10% of boost). The complexity of the game increases as the course progresses, flat track has a ring indicator that moves slowly (so it is not difficult to center the ideal position), while uphill and downhill gear shifting are faster and therefore more difficult to center. The path always goes up and down the same way, so the course is written into the game. The path in the file I sent you is not meaningful. The track is written in the game with an array or something similar so you can modify the track by simply changing the numbers. The description of the track will be numerical such as a sequence of slope angles, we start at 0 for flat and then continue after several 0's with climbs and descents. The overall track should take about a minute, but again to lengthen or shorten it will be enough to change the size of the array The boost can be consumed at any time and even partially Press boost accelerate/consume, release it and return to initial state. If a change occurs during the boost the indicator will also move much faster. We foresee phrases that can be triggered on every change, I will pass you an array of phrases based on the accuracy of the user gear shift.