hammer + nail

pneumatic hammer (20 -> +18% size and damage effects)
  now applies to nails, slugs, needles, in addition to rivets
integrated armament 20->25% damage, also if you switch guns converts guntech to new gun
backward induction removed
symbiosis removes 1 -> 0.5 max health per mob kill
plasma jet - costs 1 -> 2 research, and goes a bit farther
Occam's razor gives 36 -> 40% damage per removed tech

js/engine.js

@@ -232,15 +232,15 @@ function collisionChecks(event) {
 }
 
 //determine if player is on the ground
-Events.on(engine, "collisionStart", function (event) {
+Events.on(engine, "collisionStart", function(event) {
     playerOnGroundCheck(event);
     // playerHeadCheck(event);
     if (m.alive) collisionChecks(event);
 });
-Events.on(engine, "collisionActive", function (event) {
+Events.on(engine, "collisionActive", function(event) {
     playerOnGroundCheck(event);
     // playerHeadCheck(event);
 });
-Events.on(engine, "collisionEnd", function (event) {
+Events.on(engine, "collisionEnd", function(event) {
     playerOffGroundCheck(event);
 });