Write here your ideas!
I was surprised the Spikes includes a stun function. I sort of expected that to be a different building. So Spikes only does damage, and Leslies' Ice Trap does the stun part. I was going to suggest a Tar Pit for that purpose.
So my idea is: split the Spikes into two buildings: Spikes and a stun / slowing down building. So in any given square one can only build one or the other.
Later on in the game, RP production slows down considerably in relation to the cost of items. Maybe introducing a tower which boosts RP gain from kills within its radius would help this.
Another welcome addition would be a 'max' button for buying things. I stick to using x1 as choosing x5 inevitably requires me to go back to x1 as it is. A max button would save a few clicks after each rebirth.
Great fun game. I hope that you're still planning on improving it :)
Another thought would be to get rid of the cap on RP per level and Rebirth award MP. My Rockster rebirth upgrades are in the billions now so it would take almost 10 days of 24/7 playing to upgrade all three one time each.
I have no idea how much time or effort it takes to alter something in a game. I am purely a gamer. My programming knowledge began and ended in 1982 on the Spectrum 48k with:
10 PRINT "I AM A NOOB" 20 GOTO 10 RUN