Hi,
I'm not exactly sure what you are after, but here is a way that you can increase the speed of an object over time using Events. Depending on whether you have chosen one of the pre-build movement modules such as Platform, Bullet, or Pathfinding, you can increment speed upwards using an "every x seconds" event:
E.g.
VariableSpeed = 0
Every X Seconds
Set VariableSpeed = Object.Bullet.Speed ## Takes the old speed from the object and stores it in the variable VariableSpeed
Add 1 to VariableSpeed ## Adds 1 to VariableSpeed
Set Object.Bullet.Speed = VariableSpeed ## Sets the object's new speed to the variable VariableSpeed
end