> Flash is terrible in retrospect, but I used to love making Flash games in high school by myself. Amazing experience.

Flash isn't terrible. Flash as a browser plugin was terrible and insecure indeed. Flash was no more terrible than Java or .net on the desktop as a multimedia app platform. In fact it made it easy not only to create interactive "experiences", games, but also artist authoring tools. Alchemy allowed to incorporate C/++ code into Flash, and Flash also had its own shader editor for effects. Adobe threw the baby with the bath water.