Ani is the plural of Ana. I'm bad at names. Ana Sim is a simulation-based project. The arrows are called Ana! Click a to add an Ana! Move your mouse to the edge to modify the Ani setting. Click the space to enable or disable the settings. Click on an Ani for it to say its speed and drag to move it.
Tutorial by @griffpatch Check him out! If you're doing this with 50+ Ani I recommend you go to Turbowarp. link: https://turbowarp.org/723293799