If this is 2D I would recommend you look at renpy(its free), while it is mainly a visual novel engine, its not hard to make mini games like pong in it(see the tutorial in the ren’py sdk). In regards to how complex your simulation is this sounds like something python and ren’py script can handle.
p.s. ignoring its incomplete state you can look at my past game Project Bob (Ravenous' Uncle) , which sound similar along the same lines as what your looking to build, that is built in ren’py.