Do you have an ipad or android tablet? If so, there are lots of piano apps out there. For example, here is one that looks pretty straight forward. It doesn't have a lot of bells and whistles but it's free and might be a good way to get your feet wet. I found it doing a quick search right now.
https://www.youtube.com/watch?v=aTqRwDLNnqwPiano Maestro is good and you only have to pay after you reach a certain level, then it's $10/month.
https://itunes.apple.com/us/app/piano-maestro-by-joytunes/id604699751?mt=8 it can do alphabet OR solfege, and it also has "pause and wait," options to play one hand at a time, and so forth.
Kinderbach has an app for only $12 but I don't believe it is "interactive," just videos to follow along with (From the best I can tell, it is not set up to hear you play like the other programs but don't quote me). It is taught in note alphabet letter names versus solfege so that may or may not appeal to you depending on your preference.
For software that is not subscription based, look into
http://www.synthesiagame.com/ although they also have an app now, too. Very affordable at just $30 and they do have a pause and wait feature which I like. It's just not as super child friendly as, say, the kids cartoon piano apps. I believe they also have an option to choose solfege or alphabet names.
There is also the Piano Wizard software. The downfall is that there note scheme is very different from LMs (if that matters to you) and they are on the expensive side. You can do a payment plan through Sonlight homeschool curriculum providers and I believe they are working on an app which would hopefully bring the cost down substantially (but like others, they may turn to a subscription model). https://www.sonlight.com/piano-wizard.html Honestly, knowing that an app is coming out I probably would not fork out $400 for it right now but many people like it.
It doesn't have images associated with each note, but for what you are looking for (a similar, more affordable concept), Synthesia is probably your best bet.
But also don't overlook plain old fashioned piano books.
http://www.amazon.com/Piano-K-Self-teaching-Piano-Kids-Level/dp/0982311508/ref=sr_1_6?ie=UTF8&qid=1415445337&sr=8-6&keywords=kids+piano+book http://www.pianoforpreschoolers.com/songslessons.htmlhttp://www.thetapmethod.com/#!begin/c1ghi
And the new Piano Prodigies program looks really cute. They have some sheet music for a couple nursery rhymes on their site and the colors are pretty much compatible with LMs.
http://www.preschoolprodigies.net/If you have already done LMs, get a book that does not have colors and just color the notes in yourself correctly with a crayon.