I am developing an a survey questionnaire on kindergarten pupils' attitude towards money. i am thinking if it is possible for the survey to have only two options so as not to confuse respondents with so many options if I use a Likert Scale.
You can use answering scale of two options agree/disagree, nonetheless, you need to keep in mind that it is not Likert-like scale, i.e. not an ordinal scale rather a nominal scale. In this situation you might limit your option re statistical analyses to at most considering the item as dummy variable.
I don't work with children that young, but it is sometimes recommended for children to include questions that are yes/no or are three-point likert scale with icons. An example is here: http://njaes.rutgers.edu/evaluation/youth/docs/RCEYOUTHEVALUATION_GRK-3_FORM.pdf , although there are also some 5-point questions included there. I think you could also have 2-point Likert items with icons. For example happy/sad, lots/little.
I imagine it will be very challenging to get good data from this age group. This document brings up some points about the difficulty in interviewing children that age: http://joophox.net/publist/bms66.pdf .
Despite some of the suggestions in previous answers, I suspect your primary concern in this kind of research is developing a questionnaire that will yield valuable information for the age group you are interviewing. If you use yes/no or 3-point Likert items and have confidence in the responses, you will be able to conduct valuable analysis afterwards. On the other hand, if you are not confident with your data, any statistical advantage to using more complex Likert items will be imaginary.