7 Day Roguelike 2021: Upgrades

Today I implemented the upgrade system. You collect credits which can spent at an upgrade store.

The store presents a menu from which one of three upgrades can be chosen. There are three upgrade tracks with two levels each. Each level unlocks a new passive character upgrade. The menu includes a description of the currently-selected upgrade.

After choosing a “Level 1” upgrade, the second tier of that upgrade path becomes available, for an increased price.