Use alphabetic characters, so button symbols can be used as identifiers

keyboard.ts

@@ -1,4 +1,4 @@
-import { font } from "./font.ts";
+import { font, CHAR } from "./font.ts";
 
 const keyboard = new Map<number, {first: boolean, repeat: boolean, held: boolean}>();
 
@@ -63,10 +63,10 @@ export const shiftMap = {
 }
 
 export const altMap = {
-	"w": "⬆",
-	"a": "⬅",
-	"s": "⬇",
-	"d": "➡",
+	"w": CHAR.UP,
+	"a": CHAR.LEFT,
+	"s": CHAR.DOWN,
+	"d": CHAR.RIGHT,
 }
 
 addEventListener("keydown", (evt) => {