labs 2/6 done

tech: chain reaction - blocks caught in explosions, explode
tech: shock wave reduces explosion damage by 30% (was 40%)

slime hazards now draw themselves in hazard.query()
I updated all the maps to remove hazard.draw()
    but maybe I missed one let me know if you find a buggy slime
laser hazards also draw themselves in hazard.opticalQuery()

2/6 rooms for new level.labs() are completed

js/engine.js

@@ -41,8 +41,8 @@ function playerOnGroundCheck(event) {
                     m.yOff = m.yOffWhen.jump;
                     m.hardLandCD = m.cycle + Math.min(momentum / 6.5 - 6, 40)
                     //falling damage
-                    if (tech.isFallingDamage && m.immuneCycle < m.cycle) {
-                        m.damage(Math.min(Math.sqrt(momentum - 123) * 0.01, 0.25));
+                    if (tech.isFallingDamage && m.immuneCycle < m.cycle && momentum > 150) {
+                        m.damage(Math.min(Math.sqrt(momentum - 133) * 0.01, 0.25));
                         m.immuneCycle = m.cycle + tech.collisionImmuneCycles; //player is immune to damage for 30 cycles
                     }
                 } else {